Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['F', 'x', '8401', '3489', '3259', '7029', '3565', 'a']

6, 24, 8401, 3489, 3259, 7029, 3565, 1